irascible adj. If you describe somone as irascible, you mean that they become angry very easily.(柯林斯高阶英汉双解词典)易怒的，爱发脾气的
irritable adj. If you are irritable, you are easily annoyed(柯林斯高阶英汉双解词典)易怒的，烦躁的
通过英文释义可知，irascible用来描述别人，而irritable用来描述自己。
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